A Continuous-Time Zoom ADC for Low-Power Audio Applications
A Continuous-Time Zoom ADC for Low-Power Audio Applications
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适用于低功耗音频应用的连续时间缩放 ADC
DOI：
10.1109/jssc.2019.2959480
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发表时间：
2020
影响因子：
5.4
通讯作者：
K. Makinwa
中科院分区：
文献类型：
--
作者：
Burak Gönen;Shoubhik Karmakar;R. van Veldhoven;K. Makinwa
本文介绍了一种用于音频应用的连续时间变焦模数转换器（ADC）。它采用高速异步SAR ADC，可动态更新连续时间Δ-Σ调制器（CTDSM）的基准电压。与之前的开关电容（SC）变焦ADC相比，其输入阻抗基本上为阻性，从而降低了基准电压源和输入缓冲器的功耗。该ADC采用160 nm CMOS工艺制造，占地0.27 mm<sup>2</sup>，在20 kHz带宽内实现108.1 dB峰值SNR、106.4 dB峰值信噪比和失真比（SNDR）以及108.5 dB动态范围，同时功耗为618<inline-formula><tex-math notation="LaTeX">$\mu \text{W}$</tex-math></inline-formula>。这导致183.6 dB的Schreier品质因数（FoM）。
This article presents a continuous-time zoom analog to digital converter (ADC) for audio applications. It employs a high-speed asynchronous SAR ADC that dynamically updates the references of a continuous-time delta–sigma modulator (CTDSM). Compared to previous switched-capacitor (SC) zoom ADCs, its input impedance is essentially resistive, which relaxes the power dissipation of its reference and input buffers. Fabricated in a 160-nm CMOS process, the ADC occupies 0.27 mm<sup>2</sup> and achieves 108.1-dB peak SNR, 106.4-dB peak signal to noise and distortion ratio (SNDR), and 108.5-dB dynamic range in a 20-kHz bandwidth while consuming 618 <inline-formula> <tex-math notation="LaTeX">$\mu \text{W}$ </tex-math></inline-formula>. This results in a Schreier figure of merit (FoM) of 183.6 dB.